Method for welding ABS (Acrylonitrile Butadiene Styrene) plastic and graphite

Abstract

The invention discloses a method for welding ABS (Acrylonitrile Butadiene Styrene) plastic and graphite. In the method, firstly, a graphite plate is subjected to groove machining, and then the machined graphite plate and an ABS plastic plate are stacked and fixed through a clamp. Specific temperature is set through a temperature control device in the laser, the heating breadth size of a heating head of the laser is adjusted to meet the temperature requirement of a welding area, the heating head is aligned with the graphite plate, and the temperature of graphite to be welded reaches the preset temperature. Through the heat transfer effect of the graphite, the ABS plastic in contact with the graphite is melted. And after the ABS plastic is cooled, the connection between the graphite and the ABS plastic can be formed. In the heating process, temperature distribution of the whole breadth must be detected through a temperature detection device, and it is ensured that the temperature distribution is uniform and continuous. According to the method, ABS plastic and graphite welding can be achieved, and a new approach of a heterogeneous material welding technology is created.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding, and particularly relates to a method for welding ABS plastic and graphite. Background Art

[0002] With the rapid development of technical fields such as new energy, electric vehicles, and aerospace, the application scope of graphite plates and ABS plastics is expanding day by day, and the requirements for application performance are also increasing day by day. The welding technology of graphite plates and ABS plastics aims to meet the diverse needs of emerging technologies and shows broad market application prospects, especially in high-performance battery packs, thermal management systems, and lightweight structural components, etc. Traditional connection methods often have difficulty in ensuring the connection quality while taking into account the original performance of the materials. The proposed present invention is precisely to solve this technical problem and promote the application and development of graphite plates and ABS plastics in more high-end technical fields. Summary of the Invention

[0003] To solve the problem of welding dissimilar materials of ABS plastic and graphite, the present invention introduces a technology for welding ABS plastic and graphite. By processing grooves on the graphite plate, the graphite plate and the ABS plastic plate are superposed and fixed using a fixture. A specific temperature is set and kept warm, and the heating head of the laser is adjusted to cover the welding area of the graphite plate and heated to a predetermined temperature. The heat transfer of graphite is used to melt the ABS plastic, and a connection is formed after cooling. The technical innovation of welding ABS plastic and graphite is realized.

[0004] The technical solution of the present invention is as follows: A method for welding ABS plastic and graphite, the areas to be welded of the graphite plate and the ABS plastic are superposed and fixed, the heating head of the laser is aligned with the side of the graphite plate away from the area to be welded. After the graphite is heated by the laser, through the heat transfer effect of the graphite, the ABS plastic in contact with the graphite plate is melted. After the ABS plastic cools, a connection between the graphite and the ABS plastic can be formed.

[0005] Further, the graphite plate is one or more of the following models: ordinary graphite plates: gp-1, gp-2, gp-3; high-performance graphite plates: hpgp-1, hpgp-2; flexible graphite plates: fgp-1, fgp-2; composite graphite plates: SW-S001, SW-S002, SW-S003, SW-S004; the thickness of the graphite plate is 2 - 6 mm; the model of the ABS plastic is an ordinary ABS plastic plate or a transparent ABS plastic plate.

[0006] Further, before superposing and fixing, the laser is used to engrave grooves on the area to be welded of the graphite plate; the groove width of the groove is 0.05 mm - 0.5 mm, the groove depth is 0.05 mm - 2 mm, and the interval between adjacent grooves is 0.1 mm - 1 mm.

[0007] Furthermore, a pressing plate or a constant-pressure fixture is used to stack and fix the graphite plate and the ABS plastic, and the applied pressure range is 10 - 200 Pa. After stacking and fixing, ensure that there is a tight fit between the graphite plate and the ABS plastic plate without any gaps.

[0008] Furthermore, a high-power semiconductor laser is used as the heat source, and the laser heating head irradiates the graphite. The working distance of the heating head is 250 - 2000 mm. Through the thermal radiation of the laser, the temperature of the graphite to be welded rises to 200°C - 350°C.

[0009] Furthermore, before the laser heating, adjust the heating area size of the laser heating head to meet the temperature requirements of the welding area. The heating area size of the laser heating head is 50 mm * 50 mm - 900 mm * 1500 mm.

[0010] Furthermore, a temperature detection device is used to synchronously monitor the temperature distribution of the entire area in real time during the laser heating process.

[0011] Furthermore, a closed-loop control of temperature and power needs to be implemented during the entire laser heating process to ensure that the temperature of the graphite plate is maintained within the preset temperature range for 10 - 100 s.

[0012] Furthermore, when the welding area exceeds the welding area that can be satisfied by the heating area of the laser head, a multi-region splicing method is used for heating and welding to achieve the welding of larger-sized workpieces.

[0013] Furthermore, the cooling temperature is room temperature to the melting point of the ABS plastic, preferably room temperature to 100°C.

[0014] Advantages and beneficial effects of the present invention:

[0015] The present invention proposes a welding method for ABS plastic and graphite. This technology is innovative in the field of heterogeneous material welding. By processing grooves on the graphite plate and using a fixture to fix the graphite plate and the ABS plastic plate. Adjust the heating area size of the laser heating head to meet the temperature requirements of the welding area and heat to the predetermined temperature. The heat transfer of the graphite melts the ABS, and after cooling, a connection method is formed, effectively solving the welding problem of ABS plastic and graphite materials. In addition, this welding technology also exhibits significant advantages such as simple operation, environmental friendliness, high welding strength, and stable welding quality. In industrial applications, this technology not only improves production efficiency but also significantly reduces material waste, demonstrating significant economic benefits and broad market application potential.

[0016] This technical method has successfully achieved a high-strength and high-stability welded connection between a graphite plate and an ABS plastic by precisely controlling laser welding parameters. This technology has been widely applied in the manufacturing process of new energy batteries and the aerospace field. The present invention provides an innovative solution for the welding of graphite and ABS plastic, injecting new vitality into the development of related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the welding of ABS plastic and graphite in the present invention;

[0018] Figure 2 It is a physical picture (partial) of the welding of ABS plastic and graphite in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To deeply understand the technical details of the present invention, the present invention will be further explained below in conjunction with the drawings and specific embodiments. The embodiments of the present disclosure are not intended to cover all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as the concepts and implementation manners to be described in detail below, can be implemented in any one of a variety of ways.

[0020] The present invention is a method for welding ABS plastic and graphite. Among them, a groove is processed on the graphite plate, and the grooved graphite plate and the ABS plastic plate are stacked and fixed using a fixture. A specific temperature is set through a temperature control device and a certain heat preservation time is maintained. The heating area size of the laser heating head is adjusted to meet the temperature requirements of the welding area, and the laser heating head is aligned with the graphite plate to make the overall temperature of the graphite to be welded reach a predetermined temperature. Through the heat transfer effect of graphite, the ABS plastic in contact with the graphite melts. After the ABS plastic cools, the connection between graphite and ABS plastic can be formed.

[0021] Example 1

[0022] 1. First, prepare a common graphite plate (model gp-1) with a size of 1000mm * 500mm and a thickness of 5mm; a transparent ABS plastic plate, the shape of the plastic plate is a square frame member, the outer frame size is 1500mm * 800mm, the inner frame size is 990mm * 490mm, and the thickness is 5mm.

[0023] 2. Apply an IPG YLS1000-SM single-mode continuous laser to cut grooves with a groove width of 0.05mm - 0.5mm, a groove depth of 0.05mm - 2mm, and a spacing of 0.3mm at a position 5mm inward from the edge of the graphite plate. The direction of grooving is parallel to the side of the square of the graphite plate.

[0024] 3. Use a constant-pressure fixture to stack and fix the grooved graphite plate and the ABS plastic plate. As shown in Figure 1 , place the graphite plate in the middle position above the ABS plastic plate, and the grooved surface of the graphite plate is in contact with the ABS plastic plate. Here, apply pressure to the graphite plate and the ABS plastic plate using multiple press plates of a fixed mass. The pressure applied by the press plates is 50 Pa. After stacking and fixing, ensure that there is a tight fit between the graphite plate and the ABS plastic plate without any gaps. There is a carrier table below the ABS plastic plate, Figure 1 which is not marked in

[0025] 4. The experiment uses an IPG-DLS18000U laser. Adjust the heating area size of the laser heating head to meet the temperature requirements of the welding area. In this embodiment, the heating area size of the laser heating head is 200 mm * 200 mm.

[0026] 5. Make the laser heating head irradiate on the graphite. The working distance of the heating head is 500 mm. Through the thermal radiation on the laser heating head, the overall temperature of the graphite to be welded rises to 200 °C - 350 °C. During the entire laser heating process, use a German Cesium RF00M4 temperature control device to monitor the temperature of the entire upper surface of the graphite plate to be welded in real time and maintain the temperature for 40 s, so as to melt the ABS plastic in contact with the graphite. After natural cooling to room temperature, the graphite and the ABS plastic are connected, as shown in Figure 2 .

[0027] During the entire laser welding process, further use a FOTRIC 628C temperature detection device to monitor the temperature distribution of the entire area in real time and synchronously to ensure the uniformity and stability of the temperature distribution.

[0028] During the entire laser heating process, it is necessary to implement closed-loop control of temperature and power to ensure that the temperature of the graphite plate is maintained within the preset temperature range for 10 - 100 seconds, which is 40 s here.

[0029] If the welding area exceeds the welding area that the laser heating head can satisfy, use the method of multi-region splicing for heating and welding to achieve the welding of large-size workpieces.

[0030] Weld tensile strength test:

[0031] The product of the present invention is a welded product of graphite and ABS plastic. There is no standard test standard internationally. Due to the low tensile strength of the graphite plate and the viscoelasticity of the plastic, here, referring to the standard of GB / T 1040.1-2006 - Determination of tensile properties of plastics, the tensile strength of the weld of the product of the present invention is tested. A tensile specimen with a width of 20 mm and a length of 100 mm is taken from the product prepared in Example 1 for tensile testing (the weld is located in the middle of the specimen). The tensile strength of the weld is about 80% of the strength of the graphite plate itself. This shows that the welding strength of the present invention is high.

Claims

1. A method for welding ABS plastic and graphite, characterized in that: Overlap and fix the graphite plate and the area to be welded of the ABS plastic, and aim the laser heating head at the side of the graphite plate away from the area to be welded. After the graphite is heated by the laser, the ABS plastic in contact with the graphite plate is melted through the heat transfer effect of the graphite. After the ABS plastic cools down, the connection between the graphite and the ABS plastic is formed.

2. The method for welding ABS plastic to graphite according to claim 1, characterized in that: The graphite plate is one or more of the following models: ordinary graphite plate: gp-1, gp-2, gp-3; high performance graphite plate: hpgp-1, hpgp-2; flexible graphite plate: fgp-1, fgp-2; composite graphite plate: SW-S001, SW-S002, SW-S003, SW-S004; the thickness of the graphite plate is 2-6 mm; the model of ABS plastic is ordinary ABS plastic plate or transparent ABS plastic plate.

3. The method for welding ABS plastic to graphite according to claim 1, characterized in that: Before stacking and fixing, a laser is used to carve grooves in the area to be welded of the graphite plate; the groove width is 0.05mm-0.5mm, the groove depth is 0.05mm-2mm, and the interval between adjacent grooves is 0.1mm-1mm.

4. The method for welding ABS plastic to graphite according to claim 1, characterized in that: Use a pressure plate or a constant pressure fixture to stack and fix the graphite plate and the ABS plastic. The applied pressure range is 10 to 200 Pa. After stacking and fixing, ensure that the graphite plate and the ABS plastic plate fit tightly without any gaps.

5. The method for welding ABS plastic to graphite according to claim 1, characterized in that: A high-power semiconductor laser is used as a heat source. The laser heating head is irradiated on the graphite. The working distance of the heating head is 250-2000mm. The thermal radiation of the laser makes the temperature of the graphite to be welded rise to 200℃-350℃.

6. The method for welding ABS plastic to graphite according to claim 1, characterized in that: Before laser heating, adjust the heating area size of the laser heating head to meet the temperature requirements of the welding area. The heating area size of the laser heating head is 50mm*50mm-900mm*1500mm.

7. The method for welding ABS plastic and graphite according to claim 1, characterized in that: The temperature detection device is used to perform real-time synchronous monitoring of the temperature distribution of the entire width during the laser heating process.

8. The method for welding ABS plastic to graphite according to claim 2 or 5, characterized in that: The entire laser heating process requires closed-loop control of temperature and power to ensure that the temperature of the graphite plate is maintained within the preset temperature range for 10-100s.

9. The method for welding ABS plastic and graphite according to claim 1, characterized in that: When the welding area exceeds the welding area that can be heated by the laser head, a multi-area splicing method is used for heating and welding to achieve welding of larger workpieces.

10. The method for welding ABS plastic and graphite according to claim 1, characterized in that: The cooling temperature is room temperature to the melting point of ABS plastic, preferably room temperature to 100°C.

Images